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<?php $test = [ "tesT StriNg%&/()=?aj-hd_86b", "tesTStriNgaj-hd_86b" ]; foreach ($test as $str) { echo (!preg_match("/[^[:alnum:]\-_]/",$str)) ? $str." is valid.\n" : $str." is NOT valid.\n"; } ?>
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
tesT StriNg%&/()=?aj-hd_86b is NOT valid. tesTStriNgaj-hd_86b is valid.

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40.63 ms | 410 KiB | 5 Q